My colleagues and I quite often work on the same project and currently there is no other workaround for co-working than duplicating the project and migrating it afterwards. If there is any, I would be really happy if you could share your procedure. The workaround I just explained is not the best user experience and has various limitations. For example, for any CMS section this workaround does not work since items would need to be added retrospectively in the main project.
I would already be super excited if single pages would be "locked", i.e. only one person can work on a given page at the same time. Real-time collaboration, like Airtable does it, would be a tremendous upgrade for the user experience but is probably a quite large feature.